試錐 is read as しすい (shisui) and means boring.
しすい
shisui
しすいき
drill (for boring)
しあい
match
しけん
examination
こころみ
attempt
しこうさくご
trial and error
ためす
to try (out)
ためし
trial
こころみる
to try
しうんてん
trial run
しあん
tentative plan
しさん
trial calculation
しけんてき
experimental